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  1. #1
    Cool breeze's Avatar
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    Loft / temp rating

    Found a nice chart the other day but can't find it . Have loft of down and temp range. Anybody point my in the right direction ? Thx

  2. #2
    Senior Member Deadphans's Avatar
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    I had asked this question not to long ago and I was informed by a gracious member that western mountaineering uses this formula to determine degrees fahrenheit:

    67 - 18 x loft

    (p.e.m.d.a.s.)

    It seems fairly accurate and I have no clue how folks figure these things out. But thankfully they do
    "In seed time learn, in harvest teach, in winter enjoy." -D'Signore's, Tide Mill Farm, Edmunds, Maine.

  3. #3
    all secure in sector 7 Shug's Avatar
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    I had this on file......
    Shug

    Whooooo Buddy)))) All Good in the Backwood Hood.

    Shug's YouTube Videos

  4. #4
    Cool breeze's Avatar
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    Thanks guys just what I was looking for shug . Waiting for the next report from sector 7 :-)

  5. #5
    all secure in sector 7 Shug's Avatar
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    Quote Originally Posted by Cool breeze View Post
    Thanks guys just what I was looking for shug . Waiting for the next report from sector 7 :-)
    Whoooo Buddy.....in and out of Sector Seven with work so it may be a while for a forthcoming report.
    Whooooo Buddy)))) All Good in the Backwood Hood.

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  6. #6
    Senior Member TheIrishmanHangeth's Avatar
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    Quote Originally Posted by Shug View Post
    I had this on file......
    Shug

    So what does this translate into in terms of oz of down? IE, how many oz of down per inch of loft? And are we talking 800, 850, 900 fill?

  7. #7
    Senior Member vwgerald's Avatar
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  8. #8
    Senior Member HappyHiker's Avatar
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    Quote Originally Posted by TheIrishmanHangeth View Post
    So what does this translate into in terms of oz of down? IE, how many oz of down per inch of loft? And are we talking 800, 850, 900 fill?
    In order to calculate that, you need to figure out the volume of the chamber being filled, and the fill power of down being used.

    Length x Width x Height / fill power

    For example a chamber 50" long, 6" wide and a 2.5" baffle height with 550, 700 and 900 fill power:

    50x6x2.5= 750 cu in

    750 / 550 = 1.36 oz
    750 / 700 = 1.07 oz
    750 / 900 = .83 oz

    You can also figure out an overstuff value by multiplying the oz by the % of overstuff desired. Using the 900 fill calculation from above and adding a 20% overstuff:

    .83 oz x .2= .17 (rounded up from .166)
    .83 oz + .17 oz = 1 oz per chamber.

    There are a couple of fill calculators on HF that will do all the calculations for you if you enter the numbers into them - Catsplat and Meteor are 2 that come to mind. Great tools, especially when calculating radial/differential baffles.

    And just to give proper credit, I believe Shugs chart originated from http://thru-hiker.com/projects/down_quilt.php
    Last edited by HappyHiker; 05-02-2013 at 01:51.
    Experience is the worst teacher - it presents the exam first and the lesson later. - Unknown

  9. #9
    Senior Member TheIrishmanHangeth's Avatar
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    Quote Originally Posted by vwgerald View Post
    Quote Originally Posted by HappyHiker View Post
    In order to calculate that, you need to figure out the volume of the chamber being filled, and the fill power of down being used.

    Length x Width x Height / fill power

    For example a chamber 50" long, 6" wide and a 2.5" baffle height with 550, 700 and 900 fill power:

    50x6x2.5= 750 cu in

    750 / 550 = 1.36 oz
    750 / 700 = 1.07 oz
    750 / 900 = .83 oz

    You can also figure out an overstuff value by multiplying the oz by the % of overstuff desired. Using the 900 fill calculation from above and adding a 20% overstuff:

    .83 oz x .2= .17 (rounded up from .166)
    .83 oz + .17 oz = 1 oz per chamber.

    There are a couple of fill calculators on HF that will do all the calculations for you if you enter the numbers into them - Catsplat and Meteor are 2 that come to mind. Great tools, especially when calculating radial/differential baffles.

    And just to give proper credit, I believe Shugs chart originated from http://thru-hiker.com/projects/down_quilt.php
    Thanks folks!!

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